Fact: Shiigeru crashed into the surface of Luminaire VII.
Fact: Shiigeru’s impact caused extensive environmental damage, both in the form of permanent impact craters large enough to be visible from orbit, and in the massive atmospheric phenomena that followed. These phenomena include an atmospheric firestorm, a concussive blast that collapsed buildings in the city of Arcurio some 700km away, and a dust cloud extending far enough in all directions that the city was engulfed.
Fact: The concussion wave alone presented a potentially fatal danger to any residents of Arcurio who were unlucky enough to be outside when it passed.
Fact: The following dust cloud constituted a breathing hazard, especially mixed with the rubble and airborne particulate from collapsing buildings, for days.
Fact: The Caldari Navy’s investigation confirmed that during the Shiigeru’s plummet towards the plant, before the ship was rendered catastrophically destroyed, Yanala had shut down “all volatile systems on board, including the heavily damaged propulsion system, rendering them completely inert before the ship broke apart in orbit. Additionally, the doomsday device had been taken offline several minutes before, not only preventing it from firing but also preventing it from entering an active cooldown phase.” According to the Caldari Navy’s examination, Yanala’s actions prevented the extermination of all life across Luminaire VII, which otherwise might have occurred had certain components of the Titan exploded upon impact and claimed millions of lives, while rendering Luminaire VII uninhabitable.[1]
Fact: Had Shiigeru not been in Luminaire, it could not have crashed into the surface of the planet following catastrophic damage.
Shiigeru crashed into the planet. In doing so, it killed a whole lot of people and generally destroyed a whole lot of stuff. It could not have done this if it were not present. The potential damage could have been considerably worse, up to and including the complete eradication of all life on-world.
That means it presented a danger to all life on Caldari Prime. You need not threaten in order to be a threat. You need not be the party responsible for the damage you end up inflicting. You are still a potential danger, i.e. a threat.